If you live near HEB, then I would highly recommend Dr. Alfredo Santesteban--he has been great with my son. His office staff is very kind and caring; they know my son and greet him enthusiastically at every visit, they answer my questions patiently and promptly, they always follow up so that I am not left to wonder if everything is all right, and finally they make same-day appointments with ease (even 20 minutes after I've called).
Dr. Santesteban also has an after-hours nursing service that has been a blessing to call for help during those middle of the night emergencies. Plus, he is affiliated with Cooks Childrens' which means that if my son has to go to a hospiatl, he'll be getting the best pediatric care. Santesteban's office is near Harris Methodist HEB. Good luck!